noun, plural (especially collectively) pupfish (especially referring to two or more kinds or species) pupfishes.
any of several tiny, stout killifishes of the genus Cyprinodon, inhabiting marshy waters in arid areas of western North America: several species are endangered.

1945–50; pup + fish

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The pupfish were selected from the two populations in order to maintain genetic diversity.
Pupfish are extremely territorial, and the males will fight aggressively to protect the area they claim.
Capturing, holding, and relocating fish is likely to result in incidental take of fish and/or pupfish eggs.
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